Growth and Element Content of Red Pine Seedlings Grown in Brown Forest Soil acidified by adding H2SO4 Solution.
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概要
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To obtain basic data about the effects of soil acidification induced by acid deposition on woody plants growing in the East-Asia, the growth tnd element content of red pine (<I>Pinus densiflora </I>Sieb. et Zucc.) seedlings grown in brown forest soil acidified by adding H<SUB>2</SUB>SO<SUB>4</SUB> solution were investigated. In the case of soil acidification without leaching of cations from the soil, H+ was added as H<SUB>2</SUB>SO<SUB>4</SUB> solution to the soil at 10, 30, 60 or 90 meq H<SUP>+</SUP>·L<SUP>-1</SUP> air-dried soil. Soil without theadditional supply of H<SUP>+</SUP> was used as a control. On the other hand, inthe case of soil acidification with leaching of cations from the soil, the soilwas put in the container after soil acidification by the above-mentioned method. Water of threetimes of the amounts of the volume of the soil was poured to thecontainer. After 3 days, water was gradually pulled out from the bottom of the container. The seedlings were transplanted to the acidified soils or the controlsoil, then they were grown in a greenhouse for 120 days from 2 June to 29 September, 1995.<BR>The Al concentration of soil solution in the acidified soil increased with increasing the amount of H<SUP>+</SUP> added to the soil. The total dry weight of the red pine seedlings were decreased by the addition of the H<SUB>2</SUB>SO<SUB>4</SUB> solution. Increase of Al concentration in the underground part ofthe red pine seedlings decreased the concentration of elements such as Caand Mg in the ground part.<BR>On the other hand, the growth of red pine seedlings was dependent not only on the Al concentration but also on the balance of Al and cations such as Ca, Mg, K in the soil solution. When the (Ca + Mg +K)/Al molar ratio of soil solution becomes less than 7.0, total dry weight decreased obviously, and it decreased to approximately 40% in the case of 1.0 in the molar ratio.<BR>Therefore, while the concentration of plant-harmful metal, Al, in the soil solution is an important factor, in the case of red pine seedlings, the concentrationof plant-required elements such as Ca, Mg, and K are also needed to be considered.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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